Is crypto not a ponzi as an investment, though? Who in their right mind buys currency and sits on it as an investment? If it has utility as a currency, then use

Is crypto not a ponzi as an investment, though? Who in their right mind buys currency and sits on it as an investment? If it has utility as a currency, then use it as one, otherwise it is just speculative, and a speculative investment which relies on other people to buy out your stake and has no positive cash flow is a ponzi. No?